Q&A

 Master

Since the introduction of the second generation of "On Board Diagnostics" (OBD2) around 1996 there has been a Check Engine, A Service Engine Soon or a light that has an icon representing an engine depending on your vehicles manufacturer. This light should illuminate when you first turn on the ignition key and extinguish when the engine starts. If this light comes on while the engine is running the computer in the car sees a fault that is causing excess emissions and may result in diminishing power and fuel economy. A Check Engine light ( or MIL light as it is officially called) that is flashing as you drive is a sign of a fault that will cause damage to the catalytic converter which apart from being expensive to replace could result in your car braking down or worse your cat. convt. could over heat and cause a fire. The fault the computer sees is stored in the memory of the computer and is obtained by using a Scantool.

 Journeyman

The flashing check engine light indicates an active and severe misfire.
Audi advises not to run the vehicle in this state.

 Master

When the Check Engine Flashes Its reading out a code you count the number it flashes follow by a pause then it flashes out the second digit codes are usually 2 digits.